Bearing for spindles of grinding-machines.



No. 811,33'9. PATENTED JAN. 30, 1906. 2.11. TUCKER. BEARING FOR SPINDLES0F GRINDING MACHINES. APPLIQATIO'N P11111) 11111311.1902.

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Nrrnn srnrnsnrnrrr OFFICE.

ZECHARIAH RHODES TUCKER, OF PROVIDENCE, RHODE ISLAND, ASSIGNOR TOIROQUOIS MACHINE COMPANY, OF BEDFORD, NEW YORK, A COR- PORATION OF NEWYORK.

Specification of Letters Patent.

Patented Jan. 30, 1906.

Application led June 1l, 1902. Serial No. 111,221.

T0 all whom it may concern:

Be it known that I, ZECHARIAH RHODES TUCKER, residing at Providence, inthe county of Providence and State of Rhode Island, have inventedcertain new and useful Improvements in Bearings for Spindles ofGrinding-Machines, &c., of which the follow ing is a full, clear, andexact description, such as will enable others skilled in the art towhich it appertains to make and use the same.

This invention relates to bearings for the tool-spindles ofgrinding-machines, &c.; and its object is to provide a mounting orbearing for such tool-spindles which shall be simple in construction,easily adjusted, and efIicient in operation.

To this end the invention consists in the features of construction,arrangement of parts, and combinations of elements which will behereinafter more fully' set forth and the novel features thereof pointedout in the claims at the end of this specification.

The invention is illustrated in connection with a grinding-machine; butit will be evident that it is capable of application in connection withbearings of various kinds.

A specific embodiment of the invention is illustrated in theaccompanying drawings, in Which- Figure 1 is a top plan view of agrindingmachine with my invention applied thereto, part of the bed beingbroken away. Eig. 2 is a longitudinal section of spindle and bearingsconstructed in accordance with my in- Fig. 3l is a sectional view online :c a; of Fig. 2, showing the means for supplying the lubricant tothe toolspindle. Fig. 4 is a similar view showing a modified form oflubricant-passages.

Similar reference characters refer to similar parts throughout theseveral views.

Vith es ecial reference to grinding-machines it will be understood thatin grinding very small holes in order to obtain the requisite surfacespeed of the small emery-wheel it is necessary to get a very high speedof the spindle, and accordingly the small cone-bearings adjacent theemery-wheel which necessarily approximate in diameter somewhatcloselythe diameter of the emery-wheel are subjected to great frictionin their bearings. The present construction is designed with a .in thechuck.

' the collar 13 on the spindle 6.

view of obviating this disadvantage and making possible the efficientuse of'a very small emerywheel With correspondingly small spindle.

In Fig. 1, A represents diagrammatically the frame or bed of themachine, upon which is mounted a chuck B of any suitable construction.-An extension C of the bed carries a fixture D, upon which in suitablebearings is supported an auxiliary or speeding shaft 1, having thereon aplain pulley 2 Vand grooved pulley 3. Arms f1 4 project from the fixtureD and carry at the end thereof alined bearing-sleeves 5 5, which areadapted to carry a tool-spindle in line with the work The tool-spindle6, which carries at one end the small emery or abrading wheel 7, extendsthrough a long hollow sleeve 8, and a cone-bearing 9 on the spindlecooperates with a corresponding bearing-sur face 1() of the sleeve. Onthe outer end of the spindle 6 is a taper sleeve or bearing 6a. Thisbearing-sleeve is threaded at its righthand end only, and the main partof the hole through the same is not tapped, but is 'fitted upon thecylindrical part of the spindle 6, as shown in Fig. 2. The end of saidsleeve is cut with one or more cuts, splitting the same down aboutone-half of its length. A small grooved pulley 1l, which is adapted tobe driven from a larger pulley 3, has a bearing upon the outer end ofsleeve 8, and this pulley is connected to the spindle 6 in order todrive said spindle by means of a collar 12, which is bored with ataper-hole to fit the tapering end of the bearing 6a. This collar isalso provided with a small pin 12', entering one of the cuts in thebearing in order to provent it from turning. A lock-nut 12b holds Thisconstruction enables the operator to hold the bearingsleeve in place asadjusted by means of the collar l2 while the nut 12' is being tightenedon the spindle and locks the taperbearing in place. Pins 13 project fromthe pulley 11 and are adapted to 'lit loosely in holes in thedriving-collar 12. In this'way the 'parts will be securely lockedtogether, yet in such manner as to allow a certain amount of freedom ofmovement of the pulley independent of that of the spindle in or der toprevent undue heating of the bearings and for other purposes which willbe obvious.

IOO

The-sleeve 8 has independent bearings,

l such that it is rotatable with respect to the sleeve 18.

thereon between the two supports. spective bearings can'be formed ofanyidesired bearing-sleeves 5 and independently of the spindle 6. Thesebearings are formed by the bearing-surfaces 16 and 17 at its two ends,the first integral therewith and the second in the form of a sleeveadapted to be adjusted thereon, which coperate withcorrespondingly-tapered bearing-sleeves 18, supported in any desiredposition within the bearing sleeves 5 by means of the rnuts 19, screwedonto the threaded outer ends of each bearing- Thus thebearings can beadj usted very readilyf-rom theoutside by loosening one nut 1 9, thenadjusting the sleeve by ymeans of the other, and tightening both nutswith thesleeve inanydesired position. Sleeve 17 rests at its inner endagainst shoulders ,20, 4formed' on the sleeve-8, and can -be Vadjustedand locked by meansof the nut 21. 'Sleeve 8 may be rotated by means ofpulley 22 fast The rematerialypreferably so as to have opposite metalsincontact for the purpose-of reducing friction. Pulley'22 is driven by abelt from .the-pulley2, and a construction is accordingly v provided bywhich the. wheel-spindle and its bearing-sleeve may be independentlydriven at speedswhich may be proportioned as desired by properlyproportioning the Vrelative sizes ofthe drivingnand driven pulleys. Inoperation the` wheel-spindle is .driven at any desired speed, andthe'hollow spindle or sleeve through. which it passes is drivenat aproportionate speed inthe same direction. Thus the friction between thecone-bearings of the tool-spindle and their bearingsurfaces inconnection With the outer sleeve is reduced,

-as such friction is the result of a speed which is the difference inspeeds of the tool-spindle 6 and the vhollow spindle 8, and it ispossible to drive grindingavheels of very small diameter at a very highsurfacespeed without in? jurious friction to the bearings.

The means for supplying a lubricant to the bore in the sleeve 8, throughwhich the toolspindle 6 passes, is shown Amost clearly in Figs. 8 and 4.Ay suitable oil cup 14 is provided in the bearing-sleeve 5, anda pas.sage 15 inthe bearing-sleeve 18 communicates therewith. Through sleeve 8a passage 15a is drilled from aV point opposite the center, preferably,and as shownin'Fig. 3,so that the center of the drilled oilpassage comesabout -tangentl withA the inner bore, through which through the sleevein the manner indicated in Fig. 4. Such arrangement of oil-passages isshown only at the left hand of Fig. 2; but it will be obvious that itmight be applied to both of the bearings, if desired.

Having described my invention, what I claim as new, and desire to secureby Letters Patent, is-

1. In a device of the class described, a toolspindle, bearings therefor,means for rotating said spindle, and means for rotating said bearings,said spindle and said bearings both being adapted to rota-te upon thesame aXis of rotation.

2. In a device of the classdescribed,a toolspindle, a sleeve surroundingsaid spindle and provided with bearings therefor, and independent meansfor rotating said spindle and said sleeve upon the same axis ofrotation.

3. In a device of the class described, a toolspindle, a sleeve throughwhich said spindle passes provided with bearings therefor, independentbearings for said sleeve, and means for rotating said sleeve and saidbearings independently upon the same axis of rotation as thatof saidsleeve. 4. In a grinding-machine, in combination, a tool-spindle 6, abearing-sleeve 8 therefor, additional bearings for said bearing-sleeve8, and means for rotating' said tool-spindle and said bearing-.sleeveindependently upon a common aXis of rotation.

5. In a grinding-machine, in combination, a toolspindle 6, a sleeve 8through which said spindle passes and provided with a bearing-surface1'() coperating with the conebearing 9 on one end of said spindle, apulley 11 secured to the other end of said spindle and havingl a bearing`on said sleeve 8, independent bearings for `said bearing-sleeve, apulley carriedwith said `bearing-sleeve, and means for driving saidpulleys independently.

6. In combination, atool-spindle 6, a sleeve 8 through which saidspindle passes, said spindle being provided with bearing-surfacescooperating with corresponding bearing-surfaces within said sleeve, apulley 11 having a bearing upon the end of said sleeve, andy means forconnecting said pulley to saidspindle so that said spindle will bedriven there` by and with a provision for lost motiony in suchconnection.

7. In combination, a tool-spindle 6, a sleeve 8 through whichsaidspindle passes, said spindle being providedwith bearing-surfacescooperating with corresponding bearin,f ;surk faces within said sleeve,a pulley 11 upon the outer end of said sleeve, a collar 12 connected tothe outer end of said spindle, and the pins 18 projecting from saidpulley 11 `and fitting loosely in holes in said collar, whereby saidspindle is driven from said pulley with a certain amount of lost motiontherebetween.

8. In combination, atool-spindle 6, a sleeve S throughwhich said spindlepasses, said spindle and sleeve being provided with correspondingbearing-surfaces 9 and 10 at one end thereof, the other end of saidspindle being threaded and provided with a bearing 6a adjustable thereonand coperating with a suitable bearing-surface within said sleeve, apulley 11 having a bearing upon the outer end of said sleeve, a collar12 connected to the outer end of said spindle, connections between saidcollar and said pulley, and means for driving said pulley.

9. In combination, a tool-spindle 6, asleeve 8 through which saidspindle passes, said spindle and sleeve being provided withcorrespending bearing-surfaces 9 and 10 at one end thereof, the otherend of said spindle being threaded and provided with a bearing 6'ladjustable thereon and cooperating with a suitable bearing-surfacewithin said sleeve, the pulley 1 1 having a bearing upon the outer endof said sleeve, the collar 12 connected to said pulley, thepin-and-groove connection between said collar and said bearing 6, andthe locking and adjusting nut 12b on the end of said spindle,substantially as and for the purposes set forth.

10. In a device of the class described, a tool-spindle, bearings withinwhich said spindle is freely rotatable, and bearings within which saidfirst mentioned bearings are freely rotatable said 'spindle and saidfirstmentioned bearings being adapted to rotate upon a common axis ofrotation.

11. In a device of the class described, a tool-spindle, bearingstherefor, and common means for rotating said spindle and said bearingsupon the same axis of rotation.

12. In a device of the class described, a

4o tool-spindle, bearings therefor, and common means adapted to rotatesaid spindle and. said bearings at different speeds upon a common aXisof rotation.

13. In a device of the class described, a tool-spindle, a sleeve'surrounding said spindle and provided with bearings therefor, saidspindle being equidistant from the surrounding walls of said sleeve andmeans adapted to rotate said tool-spindle and said sleeve simultaneouslyat different rates of speed.

14. In combination, a spindle, concentrically-arranged bearings withinwhich said spindle is mounted, concentrically-arranged bearings withinwhich said first-mentioned bearings are mounted, and means adapted torotate said spindle and said first-mentioned bearings simultaneously atdifferent rates of speed.

15. In combination, a spindle, a sleeve within which said spindle isfreely rotatable, concentricallyarranged bearings within which saidsleeve is freely rotatable, and means adapted to rotate said sleeve andsaid spindle simultaneously in the same direction at different rates ofspeed.

16. In a grinding-machine, in combination, a tool-spindle, bearingswithin which said spindle is rotatable, and bearings within which saidfirstmentioned bearings are freely rotatable, said spindle and saidfirstmentioned bearings being adapted to be independently rotated andduring such rotation to remain in the s ame relative position withrespect to the article to be ground.

In testimony whereof I afliX my signature in the presence of twowitnesses.

ZECHARIAH RHODES TUCKER.

Witnesses:

I-IENRY C. BABCOGK, ALICE I-I. ABORN.

